SC E-19 EHPS - EASA

1 CRI Consultation paper Special Condition Doc. No. : SC E-19 Issue : 1 Date : 07/04/2021 Proposed Final An agency of the European Union Page 1 of 30 European Union Aviation Safety Agency. All rights reserved. ISO9001 Certified. Proprietary document. Copies are not controlled. Confirm revision status through the EASA-Internet/Intranet. Proprietary document. Copies are not controlled. Confirm revision status through the EASA-SUBJECT : Electric / Hybrid Propulsion System REQUIREMENTS incl.

2 Amdt. : ASSOCIATED IM/AMC1 : Yes / No ADVISORY MATERIAL : INTRODUCTORY NOTE: The following Special Condition has been classified as important and as such shall be subject to public consultation in accordance with EASA Management Board decision 12/2007 dated 11 September 2007, Article 3 (2.) which states: "2. Deviations from the applicable airworthiness codes, environmental protection certification specifications and/or acceptable means of compliance with Part 21, as well as important special conditions and equivalent safety findings, shall be submitted to the panel of experts and be subject to a public consultation of at least 3 weeks, except if they have been previously agreed and published in the Official Publication of the Agency.

3 The final decision shall be published in the Official Publication of the Agency." IDENTIFICATION OF ISSUE: This Special Condition has been developed to support Applications received by the Agency for the certification of Electric and / or Hybrid Propulsion Systems powered by propulsion batteries and / or fuel. These EHPS are intended to be certified: - as part of an aircraft or - as an engine product and dedicated to a known intended aircraft application. The certification specifications that are usually applicable to aircraft engines dedicated to CS-23, CS-25, CS-27, CS-29, and airships are contained in CS-E amendment 6.

4 However, this certification specification considers neither Electric and / or Hybrid Propulsion Systems nor engines intended for new product architectures such as VTOL aircrafts. Innovative EHPS and aircraft architectures bring new challenges such as new interfaces, new interactions, or new functions. It is considered challenging at this stage to provide a generic set of requirements for an EHPS that could encompass all possibilities. 1 In case of SC, the associated Interpretative Material and/or Means of Compliance may be published for awareness only and they are not subject to public consultation.

5 CRI Consultation paper Special Condition Doc. No. : SC E-19 Issue : 1 Date : 07/04/2021 Proposed Final An agency of the European Union Page 2 of 30 European Union Aviation Safety Agency. All rights reserved. ISO9001 Certified. Proprietary document. Copies are not controlled. Confirm revision status through the EASA-Internet/Intranet. Proprietary document. Copies are not controlled. Confirm revision status through the EASA-These are the reasons why this Special Condition provides the certification requirements for an Electric and / or Hybrid Propulsion System when the intended aircraft application is identified.

6 This ensures consistency between the certification requirements of the aircraft and those of the EHPS and therefore would contribute to a proper integration of the propulsion system in the aircraft. This Special Condition is articulated so as to provide objective based certification requirements which are independent of the propulsion system design or architecture. The type of technology used in the propulsion system will be addressed in the Means of Compliance. Means of Compliance will depend on the type of EHPS that is considered and on the type of aircraft on which the EHPS is intended to be integrated.

7 CRI Consultation paper Special Condition Doc. No. : SC E-19 Issue : 1 Date : 07/04/2021 Proposed Final An agency of the European Union Page 3 of 30 European Union Aviation Safety Agency. All rights reserved. ISO9001 Certified. Proprietary document. Copies are not controlled. Confirm revision status through the EASA-Internet/Intranet. Proprietary document. Copies are not controlled. Confirm revision status through the EASA-Special Condition Electric / Hybrid Propulsion System (EHPS) Contents SUBPART A - GENERAL.

8 5 SCOPE .. 5 MEANS OF COMPLIANCE .. 6 TERMINOLOGY .. 7 EHPS CONFIGURATION ..10 IDENTIFICATION ..10 INSTRUCTIONS FOR CONTINUED AIRWORTHINESS (ICA) ..10 INSTRUCTIONS FOR INSTALLATION AND OPERATION OF THE EHPS ..11 RATINGS AND OPERATING LIMITATIONS ..11 SUBPART B DESIGN AND CONSTRUCTION .. 13 MATERIALS ..13 SAFETY ASSESSMENT ..13 EHPS CRITICAL PARTS ..14 FIRE PROTECTION ..15 STATIC AND FATIGUE LOADS ..15 STRENGTH ..16 VIBRATION SURVEY ..16 OVERSPEED AND ROTOR INTEGRITY ..16 ROTATING PARTS CONTAINMENT.

9 17 CONTINUED ROTATION ..17 RAIN CONDITIONS ..17 ICING AND SNOW CONDITIONS ..17 BIRD, HAIL STRIKE AND IMPACT OF FOREIGN MATTER ..17 SUBPART C SYSTEMS AND EQUIPMENT .. 19 FUEL SYSTEM ..19 LUBRICATION SYSTEM ..19 COOLING SYSTEM ..20 EQUIPMENT ..20 CRI Consultation paper Special Condition Doc. No. : SC E-19 Issue : 1 Date : 07/04/2021 Proposed Final An agency of the European Union Page 4 of 30 European Union Aviation Safety Agency. All rights reserved. ISO9001 Certified.

10 Proprietary document. Copies are not controlled. Confirm revision status through the EASA-Internet/Intranet. Proprietary document. Copies are not controlled. Confirm revision status through the IGNITION SYSTEM ..20 EHPS CONTROL SYSTEM ..21 TIME-LIMITED DISPATCH ..23 AIRCRAFT INSTRUMENTS ..23 ELECTRICAL POWER GENERATION, DISTRIBUTION AND WIRINGS ..24 PROPULSION BATTERY ..24 SUBPART D SUBSTANTIATION .. 25 GENERAL CONDUCT OF TESTS ..25 ENDURANCE DEMONSTRATION ..25 DURABILITY DEMONSTRATION.